Ball-mill



H. SELLMAN BALL MILL. APPLICATION FILED FEB. gs, 1920.

L$63fi$g Patented Dec. 28, 1920.

2 SHEETS-SHEET 1- I 4 I :5 LG. 1.0

INVENTOR A TTORNEY I H SELLMAN- A ORNE intake cover would be on top.

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HIGHEST SELLMIAN, ill BROOKLYN, NEW YORK.

BALEPTKIYLL.

Application filed February 5%, 1926- Serial No. 861,599.

To all w 710m it may can earn Be it known that l, HENRY SELLMAN, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of News York, have invented certain new and useful Improvements in Ball-Mills, of which the following is a specification.

This invention relates to ball or pulverizer mills, and especially to that class in which a rotatable drum is provided. with an upper charge opening and a lower discharge opening controlled by a suitable Valve.

The chief object of my invention is to provide a pulverizer drum with such facilities for being charged with raw materials and discharging treated matter as to corn siderably reduce the time and labor involved, and to entirely eliminate the danger of dropping dirt or raw material into a batch of finished material.

Further objects will appear as this specification proceeds.

In the accompanying drawings,

' Figure 1 is a longitudinal, sectional view of an apparatus embodying the present invention.

Fig. 2 a central, transverse section of the same apparatus.

Fig. 3 is an enlargement of a. portion of Fig. l.

Fi 4: is an enlarged plan view of part 5 illustrated in Figs. 1 and Fig. a central view of Fig. 4c. in longitudinal section.

Fig. 6 is an enlarged view of part 11 of sembled.

Fig. 8 and 5.

Throughout the views the same reference characters refer to the same parts.

In attrition mills for grinding different materials in liquid media of various kinds, it has been customary to stop the mill when the grinding was finished so that the charge This cover would then. be replaced by a special discharging cover, after which the drum would be turned half a revolution to locate the disis a view of part 28 of Figs. 4

charge cover in its lowest position and the contents drained off. If the pulverized matter is of a very viseid consistency, {this method will not avail to withdraw the contents satisfactorily from the mill.

It is one of the chief aims of my invention to facilitate the efficient Withdrawal of all such liquids and pastes from the mill.

Referring again to the drawings, the castings 1 and 2 are provided with alined shafts or trunnions 13 and ll,v and with peripheral flanges secured within the extremities of the annular sheet 3 by welding, sweating or by means of rivets, according to the choice of the manufacturer.

Surniounting the apparatus is shown the charging cover 12, secured in position by swing bolts and nuts 15. The pebbles or balls used in the apparatus have been omitted to clarify the views. However, in order to protect material to be ground from being contaminated, and to assist in the grinding operation, the usual porcelain or other lining 10, 1 and 20 has been provided.

Dianuitrically opposite the charging cover 12 is the special discharge valve 5 which provides the chief advantages of my invention. The valve casing 5 is intended to be permanently secured to the drum in contrast with the charging cover; and contains clined floor to cause gravitation of liq toward outlet 2%, the cap 25 normally closing this outlet. Vihile the valve is ordinarily a permanent part of the drum and is never removed in the course of operating the mill, yet it may be necessary to occasioually remove it to renew worn parts, but its permanent character in the matter of its location is one of its chief advantages. in order to preventany of the balls inside the drum from dropping'out, a strainer disk 28 has been inserted in the valve, and is pr0-' vided with a plurality .of moderately large orifices 26, presenting minimum resistance to ground stock when it is desired to draw oil" the same. i I I When the mill is in operatiom'th mom tioned orifices in disk 28 are covered bytha sector plate 9.3, which is adapted to turn,

a drain chamber '7, which latter has angn-" C0 VE F111 flange 30 acting as an air with valve stem 6 when hand wheel fl is rotated, this result being insured by the loser tion of a pin 34 which passes through stem 6 and lies in a slot in. the sector plate. possible movement is but a quarter revolution, inasmuch as the pin or stud 27 on the sector plate is limited between pins 332 and in the channel 9 of the strainer disk. Thus it is evident that i re sector plate is both normally in contact with the strainer disk and is limited to accurate open and closed posi tions in relation to said disk.

However, it may be found :ulvantageous, at times, to slightly lift the sector plate Without turning it, and by this means Junthe strainer disk. The construction of the valve permits this, for while the washer 29 is pressed down upon the collar .16 by contact with a-gland 18. thereby re taining the plate 23 innorinal contact with strainer disk 28, the washer. it will be noted. isactually a coil spring of one turn. It is only necessary to loosen set screw 17 and se cure the collar '16 a little lower on the valve stem 6 after having substituted a reguh r coil spring for washer 2S), and the plate 23 may he lifted very considerably. thereby exposing the openings in the disk.

As an auxiliary means to. assist in the operation of discharging, an air nipple or inlet 4 has been providedin the cover 12. .Vhen the drum is rotated, the. plug! ll prevents any leakage by stopping the air vent in t. More detailed, the plug has a threaded portion 31 to fit the thread in nipple a. the tight stop. while shank 21 completely fills the orifice in the porcelain lining of the'cover In the operation of the mill. the swing bolts 15 are loosened and cover 12 removed. Granting that a quantity of balls. are present in the drum, crude matter to be treated is introduced in sutlicient quantity to constitute a charge, with the possible addition of a liquid such as water, oil or similar medla. The cover 153 replaced, and the plug ll, cap 25, and gland 18 are tested to see that they are light, as well as valve 5, to see that plate is closed. The drum is then rotated the proper length of time till the charge is ground.

lVhen the mill is stopped in original p0 s1t1on, the outlet cap 25 is removed. likewise vent plug it, and the valve stem 6 turned to open the valve. In case the contents flow indifferently because of their being too viscid, an air hose may be screwed to either the outer or the inner threads'of nipple t and the pressure will quickly empty the mill. Water may also be used to wash out the contents by connecting a suitable hose or pipe to the same nipple.

When empty, the drum will be ready for a fresh charge by merely closing the valve,

replacing the cap 25, vent plug 11 and open- 1. A pulverizer drum provided with an outlet valve having a. chamber therein in the peripl'ieral wall thereof, a valve stem 'eateuding from the outer portion of said valve through the casing of the latter, the chamber in said casing communicating with an exterior nipple. a strainer plate having perforated sections connecting the interior of said drum. with said valve chamber, and a sector plate secured to the. inner extremity of said valve stem and adapted to move across the pertoaitions in said strainer disk upon rotation oi said alve stem.

l n a pulrerizer drum. :1 dischargevalve having: a chamber therein provided with an exterior nipple. a sector valve stem passing through said *alve provided upon its inner extren'iity with a sector disk to move therewith. and upon its outer extremity with manually ope ative means, a collar secured gra vity valve tact therewith and concentric with the same,

a discharge pipe in said valve casing 00111 municating with its interior and provided. with a cap. the floor of said chamber being inclined from the extreme perforations in said disk toward said discharge pipe. and a. manually rotatal'ile valve stem passing through said valve casing. dish and plate. to rotate one of the latter two in relation to the other.

i. A pulverizer drum including a valve in the peripheral wall thereol having; a perforate disk covering the interior chamber thereof, a sector plate upon said disk and a rotatable valve stem adapted to move one of said contacting parts in relation. to the other to cover the perforations in said disk. and means to limit said relative movement including" in the dish a channel having; a pair of limit pins secured therein and a pin projecting: "from said plate into said channel, between said limit pins.

5. it. mill drum including a valve in the the casing of said valve and provided with perforated secions, a secisan plate 80318611- tricaily located upnn perfamwd (:isk a valve stem extending through said valve casing and said disk and sector plate 310 move one of the hitter in Relation, to the other, and exterior meana secured $0 said Valve stem by which to rotate be ame.

Signed at 132 Nassau screet, in the banmug}: of Manhatzm, county of N'v York, (any and State. of 340w 10?? this Eitn day 0% February, 19%.

HENRY SEL JMAN.

\Vitnesses:

ELIAS JQHNSUN, v G. F. Wu. i'bxzssgnmu. 

